Bring back the breaking changes readme section (#2804) #4739

Job	Run time
check	2m 13s
check-docs	23s
cargo-public-api-crates (axum)	57s
cargo-hack	5m 14s
cargo-public-api-crates (axum-core)	44s
cargo-deny check (advisories)	23s
dependencies-are-sorted	18s
cargo-deny check (bans licenses sources)	24s
cargo-public-api-crates (axum-extra)	54s
Spell Check with Typos	7s
cargo-public-api-crates (axum-macros)	42s
test-versions (stable)	3m 1s
test-nightly	1m 58s
test-docs	1m 55s
test-msrv	4m 51s
test-versions (beta)	3m 39s
armv5te-unknown-linux-musleabi	51s
wasm32-unknown-unknown	32s
	29m 6s

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